Convertible sofa



FIG. 1 is a perspective view of the convertible sofa embodying my new design and set up as a bed;

FIG. 2 is a perspective view of the convertible sofa shown in FIG. 1 and set up as a sofa;

FIG. 3 is a rear elevational view of the convertible sofa set up as shown in FIG. 1; and,

FIG. 4 is a rear elevational view of the convertible sofa set up as shown in FIG. 2.

That end of the convertible sofa not shown is a mirror image of that end shown. 

The ornamental design for a convertible sofa, substantially as shown and described. 